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Science 16 April 1999:
Vol. 284. no. 5413, p. 397
DOI: 10.1126/science.284.5413.397n
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Plant phytochromes are responsible for sensing the red and far-red portions of the light spectrum, and specific phytochromes mediate the developmental responses to specific portions of the spectrum. Hoecker et al.(p. 496) now identify a downstream signaling component that seems to process the signals from a particular phytochrome. The SPA1 protein, identified in Arabidopsis, alters morphogenesis specifically in response to light activation of phytochrome A. Other signaling components are shared among more types of phytochromes.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)